alternieren

Alternieren is a German verb meaning to alternate between two or more states, tasks, or conditions, or to take turns in a sequence. It describes patterns where elements occur successively in turn, such as day and night, two work tasks, or group assignments. The term is common in formal or technical contexts and is related to abwechseln, though alternieren emphasizes the alternating sequence rather than a simple switch.

Grammar and usage: Alternieren is a regular -ieren verb. Conjugation in the present: ich alterniere, du alternierst, er/sie/es alterniert; wir alternieren, ihr alterniert, sie alternieren. Preterite: ich alternierte, du alterniertest, er alternierte; perfect: ich habe alterniert; du hast alterniert; er hat alterniert. The prefix is not separable, and the past participle has no ge- prefix.

Common contexts include scheduling and work patterns (two teams alternate shifts), experimental design and data collection (conditions alternate across trials or blocks), and organizational practices (participants or tasks are rotated to distribute load). In everyday language, alternieren often implies a deliberate, repeating sequence rather than a one-off switch.

Common synonyms in German include wechseln and abwechseln, while rotieren is used especially for rotation of tasks.